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Finding the Fourth Proportional to 206.13, 308.79 and 137.28

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Solution

The fourth proportional to 206.13, 308.79 and 137.28 is: 205.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.13 : 308.79 = 137.28 : x
  2. Step 2: Convert to fraction form
    206.13/308.79 = 137.28/x
  3. Step 3: Cross multiply
    206.13x = 308.79 × 137.28
  4. Step 4: Simplify right side
    206.13x = 42,390.69
  5. Step 5: Solve for x
    x = 42,390.69/206.13
  6. Step 6: Final answer
    x = 205.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.